Nut-lock.



J. $CHIRRA.

NUT LOUK.

APPLICATION TILED FEB.29, 1908 91 4, 1 92.. Patented Mar. 2, 1909.

WITNESSES INVENTOR 5 are bent in opposite directions.

oNrran STATES rArnNr @FFTQE.

JULIUS SCHIRRA, or PITTSJB'URG, PENNSYLVANIA, ASSIGNOR 170 E.- A. LORTZ, or PIr'rsBURe, PENNSYLVANIA.

\ NUT-LOCK.

Nol 914,192.

Specification of Letters Patent.

. Patented March 2, 1909.

Be it known that I, JULIUS SCHIRRA, of Pittsburg, inthe county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Nut-Locks, of

which the following is a full, clear, and-exact description, reference being had to the ac-' companying drawings 'forming part of this specification, in Which Figure 1 is a side elevation of a bolt and nut provided with my improved nut lock; Fig. 2 is a plan view of the nut lock of Fig. 1;. Fig. 3 isa plan view of a modified form of Washer; and Figs. 4, 5, 6 and 7 are views showing other forms, Fig. 5 being a detail of a ortion of Fig. 4.

i y'invention relates to the ClaSStOf nut looks, and 1s designed to provide a cheap and simple device of this character, which can be turnedout in largefquantities and will eflectually b 1 look the nut against turning on the To that I end the invention comprises a washerjhaving a hole provided with a'no tch at one side, at least one of the notched walls being'bent so that the thread of the bolt is engaged on one side of one wallof the notch and in the other side of the .other wall of the notc It also consists in the construction and arrangement of the parts as hereinafter fiully described and claimed.

In the drawings, referring to the forms of Figs. 1, 2 and 6; 2 represents a iece of sheet metal having its ends bent or anged downwardly, as shown at 3'. This piece or plate is provided with a central hole having a. side notch, of which one wall 4 is bent laterally, while the other wall 5 may remain in itsoriginal position or may be bent in the opposite direction. Preferably, the walls 4 and In using the device, when the nut 6 has been screwed upon the threads of the bolt 7, the nut lock is screwed to its desired position into engagement with thenut. Any attempt of the nut to back off is then resisted by the walls 4 and 5 engaging a thread of the bolt. As the tendency to turn backwardly increases, the

tightening action of the nut lock is increased,-';.

owing to the pinching of the thread'between the two walls of the notch. The side flanges or lips aid in this action, as they give a springy action to the clamping oi the thread: The function of these lips is to give this springy action.

Instead of using a square or rectangular lpllate, I may employ a plate-8 of general exagonal .form, as shown in Fig. 3, this" preferably having the side flanges 9 9, as

efore, and also the notch with the oppositely bent walls 4 and 5". Of course, the number of lips or flanges on the plate may be varied; any desirable number being our ployedy. "Y I in Figs. 4 and 5 I show a form wherein an additional Washer- --10 is employed between the nut and themain'washer, this additional Washer having inwardly bent rongs 11,

which are notched to engage the threads with their inner walls. These-prongs areof a springy character, and as the nut attempts to ack oil, I obtain not onl the action of the lock proper 2, but also th the prongs of the added washer into the threads ofthe bolt. Where both the nut lock and the washer are used, as in Fig. 4, the holethrough the washer may be an ordinary cylindrical holej also be employed'alone as a nut lock, in which case it will be provided with the notch having thegoppositely bent Walls 4 and 5 as in the first form.

e clamping of This washer .10 may In Fig. 7, I show aiorm'simil'ar to that of I sides of the circle being struck down into curved flanges 12, each flange contacting with the nut at its central ortion. These flanges are also preferably owed inwardly slightly, as shown by the cross section, and the body 13 is also preferably bowed slightly, as'shown'in this figure. giving the s ringy action and in preventin in ropler de ection. In this case, the notc wlit e oppositely bent walls Wlll be eme nail the forms of my invention, the inturned flanges of the washer (3, 9, or 12). bear against the end face of the nut at points between the planes of the opposite side of the nut. This enables the washer to be used with ordinary nuts otall sizes.

The; advantages of my. invention result This bowing aids in and gripping action afforded by the oppositely projecting walls of the notch. 7

Many changes may be 'madein the shape and arrangement of the nut look, without departing from my invention.

I claim: X 1. As a new article of manufaoture,fa-nut locking washer in the form of a thin flat piece of sheet metal with a hole therethrough, said holehaving a sin le notch in one .side and one corner of the wa of said notch being bent rlaterally to form a lip, 0 posite edge portions of the flat sheet meta piece being bent at an angle to form inwardly projecting flanges of equal length to bear :against the end face of a nut at points between the planes of opposite sides of the nut; substantially as described. 4

2. A nut lock consisting of two washers superimposed one upon the other on the end portion of the bolt, and each having lips which engage the thread of the bolt, the inner washer. having opposite edges bent inwardly and engaging the threads of the bolt adjacent to the end face of thenut, and the outer Washer having opposite edge portions bent downwardly into engagement the end face of the nut; substantially as described.

3. A nut lock comprising two superimposed plates or washers engaging the thread of the end washers having lips which engage the thread of the bolt adjacent to the end face of the nut, and the other of which has lips which bear a ainst the end face of the nut; substantia y as described.

4. A nut lock having a washer formed with a bolt hole therethrough with a notch at one side thereof, one wall of said notch being bent laterally, and opposite edge portions of the plate being bent at an angle to bear upon the end face of the nut, and a second washer inclosed by the list washer and upon which it bears, the second washer also en aging the threads of the bolt; substanti y as described. 1

In testimony whereof, I have hereunto set my hand.-

JULIUS SCHIRBA. J Witnesses:

GEo. B. BLEMING, E. A. LORTZ.

ortion of the bolt, one of said, 

